1. He is so kind to help me.

2. He is so kind as to help me.
(Which one is correct? Are both OK?)

3. Hanok is a traditional Korean house.
4. Hanok is a Korean traditional house.
5. Hanbok is a traditional Korean dress.
6. Hanbok is a Korean traditional dress.
(Which ones are correct? What is the position of 'traditional'?)

#1 is correct.

#'s 3 and 5 are correct.

1. Both sentences are grammatically correct, but they have slightly different nuances.

In the first sentence, "He is so kind to help me," the word "so" emphasizes the speaker's admiration or surprise at the person's kindness. This sentence suggests admiration for the person's helpfulness.

In the second sentence, "He is so kind as to help me," the word "as" is used to indicate that the person's kindness is shown through their act of helping. This sentence suggests recognition of the person's kindness.

2. Both forms of the sentence are grammatically correct.

In sentence 3, "Hanok is a traditional Korean house," the adjective "traditional" is positioned before the noun "Korean house." This sentence emphasizes the fact that the house is traditional.

In sentence 4, "Hanok is a Korean traditional house," the adjective "traditional" is positioned after the noun "Korean house." This sentence still conveys the same meaning as sentence 3, but it may put slightly more emphasis on "Korean" rather than "traditional."

In sentence 5, "Hanbok is a traditional Korean dress," the adjective "traditional" is positioned before the noun "Korean dress." This sentence emphasizes the fact that the dress is traditional.

In sentence 6, "Hanbok is a Korean traditional dress," the adjective "traditional" is positioned after the noun "Korean dress." This sentence still conveys the same meaning as sentence 5, but it may put slightly more emphasis on "Korean" rather than "traditional."

Overall, the difference in positioning of the adjective "traditional" in sentences 3-6 is primarily a matter of style and emphasis. Both forms are generally acceptable, but the preferred position may vary depending on context or personal preference.